Track v3 modifications

Some modification and fixes to v3::Track.

• Remove duplication of fields with nHits and numLHCbIDs
• Add accessor for trackVP and trackUT
• Rename trackFT to trackSeed
• Have a field with chi2 and a field with nDoF, change names to make it more clear.
• Add an enum_field field for the track history
• Use lhcbids_field for the LHCbIDs (with: !3288 (merged))
• q/p is now part of the state (with: !3270 (merged))

Modifications to other codes:

• Augment v1::Track to return the number of (VP,UT,FT) hits.

Needed for: Rec!2645 (merged)

@sstahl @ausachov @cmarinbe @mvesteri @poluekt @mramospe @agilman @gunther @lohenry @chasse